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Design 1/4
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Usability 2/4
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Creativity 3/4
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Content 4/4

The heart of the circuit consists of the integrated MCP2221A produced by  Microchip . This integrated is cataloged as   USB 2.0 to I2C / UART Protocol Converter with GPIO or a protocol converter from USB to UART and I2C  with IO having customizable functions.

You can use it as a bare Serial (only RX and TX) to USB converter such as the adapters based on FT232R, CH340G, PL2303, but have also some functions extra: it can act as Master on an I2C bus and there is also an Android Application with source code for this! You can read the documentation following the link in this project.

I've made also some video tutorials showing the usage of android app for I2C and UART communication:


https://youtu.be/RW8dY1DPI8E


https://youtu.be/9D3cbL2UjJk


https://youtu.be/39u7k2LZKVI


https://youtu.be/Ql55knbcVMA


Bill of materials used in this project

resistor 220Ω ¼W
4
resistor 2200Ω - 4700Ω ¼W or empty
2
depending on I2C bus/speed
2
electrolitic capacitor 220µF 16V
2
multilayer_ capacitor 220nF (pitch 2.5 ÷ 5mm)
2
multilayer_ capacitor 100nF (pitch 2.5mm mandatory)
1
tactile switch 6x6mm
1
MCP2221A/P
1
LM1117-3.3 (LD33) TO-220
2
3mm round red led
1
3mm round green led
1
3mm round yellow led
1
Jumper
1
USB type B connector
1
Apr 30,2020
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